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// Other services

Port 7683: Cleondris DMT

Port 7683 is assigned by IANA to dmt (Cleondris DMT).

7683

How dmt works

Other services
client:7683dmtresponse client:7683dmtresponse

The client sends a request to port 7683 and the dmt service answers.

Transport
TCP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 7683 dangerous?

We have no specific security note for port 7683. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 7683

ServicePortTransportDescriptionReferenceUpdated
dmt 7683 TCP Cleondris DMT - 2015-03-31
-7683-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 7683, and is it reachable?

Linux

sudo ss -ltnup 'sport = :7683'      # process listening on 7683
sudo lsof -nP -i :7683

macOS

sudo lsof -nP -i :7683

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 7683 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 7683
netstat -ano | findstr :7683

From another machine

nmap -p 7683 -sV <host>
nc -zv <host> 7683

Block it in the firewall

sudo ufw deny 7683/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 7683" -Direction Inbound -LocalPort 7683 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 7683 used for?

Port 7683 is assigned by IANA to dmt (Cleondris DMT).

Is port 7683 TCP or UDP?

Port 7683 is registered for TCP.

Is it safe to open port 7683?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 7683 is open?

On Linux run "ss -ltnup 'sport = :7683'", on macOS "lsof -nP -i :7683", and on Windows "netstat -ano | findstr :7683" to see the local process. From another machine, "nmap -p 7683 <host>" shows whether it is reachable.

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